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Actually the problem is none of the above. When you do file uploads the $_FILES array is used for all the file details not the $_POST array. If you have any details about the file in your $_POST array this is because enctype="multipart/form-data" is missing from your form tag.

image upload problem

Good spot by bokehman. The problem is because the code is using $_POST instead of $_FILES. The form tag does have - enctype="multipart/form-data" - but the value of $_POST['imgfile'] does not have an extension to get. Try